(steam:3691): GLib-GObject-CRITICAL **: g_object_unref: assertion `G_IS_OBJECT (object)' failedsaving roaming config store to 'sharedconfig.vdf'roaming config store 2 saved successfullySDL video target is 'x11'SDL video target is 'x11'This system supports the OpenGL extension GL_EXT_framebuffer_object.This system supports the OpenGL extension GL_EXT_framebuffer_blit.This system supports the OpenGL extension GL_EXT_framebuffer_multisample.This system DOES NOT support the OpenGL extension GL_APPLE_fence.This system DOES NOT support the OpenGL extension GL_NV_fence.This system supports the OpenGL extension GL_ARB_sync.This system supports the OpenGL extension GL_EXT_draw_buffers2.This system supports the OpenGL extension GL_EXT_bindable_uniform.This system DOES NOT support the OpenGL extension GL_APPLE_flush_buffer_range.This system supports the OpenGL extension GL_ARB_map_buffer_range.This system supports the OpenGL extension GL_ARB_vertex_buffer_object.This system supports the OpenGL extension GL_ARB_occlusion_query.This system DOES NOT support the OpenGL extension GL_APPLE_texture_range.This system DOES NOT support the OpenGL extension GL_APPLE_client_storage.This system DOES NOT support the OpenGL extension GL_ARB_uniform_buffer.This system supports the OpenGL extension GL_ARB_vertex_array_bgra.This system supports the OpenGL extension GL_EXT_vertex_array_bgra.This system supports the OpenGL extension GL_ARB_framebuffer_object.This system DOES NOT support the OpenGL extension GL_GREMEDY_string_marker.This system DOES NOT support the OpenGL extension GL_ARB_debug_output.This system supports the OpenGL extension GL_EXT_direct_state_access.This system DOES NOT support the OpenGL extension GL_NV_bindless_texture.This system supports the OpenGL extension GL_AMD_pinned_memory.This system DOES NOT support the OpenGL extension GL_EXT_framebuffer_multisample_blit_scaled.This system supports the OpenGL extension GL_EXT_texture_sRGB_decode.This system DOES NOT support the OpenGL extension GL_NVX_gpu_memory_info.This system supports the OpenGL extension GL_ATI_meminfo.This system supports the OpenGL extension GL_EXT_texture_compression_s3tc.This system DOES NOT support the OpenGL extension GLX_EXT_swap_control_tear.GL_NV_bindless_texture: DISABLEDGL_AMD_pinned_memory: DISABLEDGL_EXT_texture_sRGB_decode: AVAILABLEInstalling breakpad exception handler for appid(gameoverlayui)/version(20121214145418_client)Installing breakpad exception handler for appid(gameoverlayui)/version(1.0_client)Installing breakpad exception handler for appid(gameoverlayui)/version(1.0_client)Installing breakpad exception handler for appid(gameoverlayui)/version(1.0_client)[1219/010540:WARNING:proxy_service.cc(646)] PAC support disabled because there is no system implementationUsing breakpad crash handlerSetting breakpad minidump AppID = 440Forcing breakpad minidump interfaces to loadLooking up breakpad interfaces from steamclientCalling BreakpadMiniDumpSystemInitInstalling breakpad exception handler for appid(440)/version(5148_client)Looking up breakpad interfaces from steamclientCalling BreakpadMiniDumpSystemInitSteam_SetMinidumpSteamID: Caching Steam ID: 76561197996112713 [API loaded yes]Steam_SetMinidumpSteamID: Setting Steam ID: 76561197996112713ConVarRef m_rawinput doesn't point to an existing ConVarGL_NVX_gpu_memory_info: UNAVAILABLEGL_ATI_meminfo: AVAILABLEGL_ATI_meminfo: GL_TEXTURE_FREE_MEMORY_ATI: Total Free: 659873, Largest Avail: 558848, Total Aux: 1624784, Largest Aux Avail: 4096GL_MAX_SAMPLES_EXT: 8CShaderDeviceMgrBase::GetRecommendedConfigurationInfo: CPU speed: 3201 MHz, Processor: GenuineIntelGlobalMemoryStatus: 4294967295CShaderDeviceMgrBase::GetRecommendedConfigurationInfo: CPU speed: 3201 MHz, Processor: GenuineIntelGlobalMemoryStatus: 4294967295[1219/010542:ERROR:resource_bundle.cc(411)] Failed to load /home/mike/.local/share/Steam/SteamApps/videoace254/Team Fortress 2/cef_gtk.pakSome features may not be available.[1219/010542:WARNING:proxy_service.cc(646)] PAC support disabled because there is no system implementationIDirect3DDevice9::Create: BackBufWidth: 1920, BackBufHeight: 1080, D3DFMT: 3, BackBufCount: 1, MultisampleType: 0, MultisampleQuality: 0/home/mike/.local/share/Steam/SteamApps/videoace254/Team Fortress 2/hl2.sh: line 72: 3875 Segmentation fault (core dumped) ${GAME_DEBUGGER} "${GAMEROOT}"/${GAMEEXE} "$@"Game removed: AppID 440 "Team Fortress 2", ProcID 3875 saving roaming config store to 'sharedconfig.vdf'roaming config store 2 saved successfully

After that hit the windows key, type in driconf, and run the program. Type in your password and see if the program allows you to choose "force S3TC texture compression". Try and launch tf2, and report back.

That's interesting, because my card is no longer supported by amd (x2 4550s) and I'm using the open source drivers. Perhaps it is because of your username.

Linux has a filesystem that is case sensitive, for example, I could not initially run TF2 because it tried to load "[user]/.local/shared/.steam/SteamApps/zeke580." But this is a problem since I logged in with "Zeke580", so the uppercase Z threw it off.